Add automated testing for new Keycloak releases

[stianst]

Description

Add continuous testing for the extension that can verify if the extension works as expected with the latest nightly builds of Keycloak, and have automation in terms of testing when a new release of Keycloak is out.

Discussion

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Motivation

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Details

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[stianst]

I'm thinking it would be good to have two different types of test:

• Regular tests - would start KC in embedded mode - kinda like Quarkus @QuarkusTest
• IT tests - would start KC container with the extension deployed - kinda like Quarkus @QuarkusIntegrationTest

[stianst]

Maybe we should either just use Quarkus stuff directly, or do similar things like:

@KeycloakTest
@KeycloakIntegrationTest

Then we could have stuff like:

@KeycloakConfig
@KeycloakRealm

Could take some insipration from what Quarkus has around test profiles.

Inject an admin client:

@KeycloakAdminClient